王皓;肖恩照;

• 1:中国地质大学(北京)地球科学与资源学院

摘要(Abstract)：

为研究华北地台寒武系广泛出现的碳酸盐岩核形石沉积学特征,选取山西灵丘刁泉剖面寒武系张夏组顶部颗粒滩相鲕粒灰岩中发育丰富的细粒核形石,进行碳酸盐岩微相分析。宏观上,根据岩性变化反映的沉积相叠加样式,将张夏组划分为3个Ⅳ级层序,核形石集中产出于第三个Ⅳ级层序顶部颗粒滩相鲕粒灰岩;微观上,根据核形石核心与纹层的组分、形态及结构特征,将张夏组核形石划分为5个类型:复合核形石、同心圈层核形石、偏心核形石、泥晶核形石及薄层核形石;超微观上,双矿物结构核形石的方解石圈层与暗色泥晶圈层的元素组成相同,但矿物结构不同,且在双矿物结构圈层之间发现细胞外聚合物(EPS)的残留物。结果表明,张夏组核形石,特别是亮暗交互纹层及暗色泥晶组构,是由以葛万菌为主的蓝细菌为主导的生物膜或微生物席钙化作用形成的;复合核形石表现出的、对颗粒的粘结与捕获作用,以及偏心核形石部分圈层因生长优势而出现的增生现象代表钙化生物膜的沉积记录。

关键词(KeyWords)：核形石;生物膜;细胞外聚合物质;寒武系;刁泉剖面

Abstract:

Keywords:

基金项目(Foundation):国家自然科学基金项目(41472090,40472065)

作者(Author):王皓;肖恩照;

Email:

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